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Red Tube 

Guy 1: Have you seen the new show on YouTube Red?
Guy 2: Can’t, I don’t have any money
Guy 1: Oh, just get Red Tube then, it’s free
Red Tube by Your Uncle Marvin November 25, 2019

red tube sock 

When engaged in anal sex, you pull out very quickly causing her rectum to invert, creating the "red tube sock."
red tube sock by Barkley Jones December 5, 2013

red lid tube

A sterile, plastic tube with a red lid similar in nature to those marketed by Falcon but from a (much) cheaper manufacturer.
PhD student 1: We're out of red lid tubes.
PhD student 2: Oh you balloon! You didn't order any.

Technician: Shall I order some red lid tubes?
PhD student: Yes. Bail on.
red lid tube by UrbanBiochemist October 31, 2011
The youtube of porn, sex and XXX rated content. Not safe for work and you should be over 18 to visit.
Man, with redtube I don't need to download any more porn!
redtube by Dave Carben May 23, 2007
Known by every decent man who has some dignity and respect towards his own cock. Often seen as a sense of escape and is a forbidden topic around females.
man 1: what's been happening?

man 2 nods in recognition that he's been on redtube, says nothing.

man 1 nods then salutes .... nothing is said or asked after, just respect for the tube.
RedTube by Sweaty Noel 69 June 22, 2008
HOLY SHIT! Best site for looking up porn if you're horny. It's just kinda...there. No bullshit to put up with.
redtube by JamesF1987 October 31, 2007